Ordovician (1 gen 486850000 anni a. C. – 1 gen 443100000 anni a. C.)

Descrizione:

The Ordovician is a geologic period and system, the second of six periods of the Paleozoic Era, and the second of twelve periods of the Phanerozoic Eon. The Ordovician spans 41.6 million years from the end of the Cambrian Period 486.85 Ma to the start of the Silurian Period 443.1 Ma.

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